Sound reproducer



Dec. 29, 1925- x G. c. TICHENOR scum) REPRODUCER Filed July 31 1922 WC gidimmi/ I i fi y Patented Dec. 29, 1925.

GEORGE C. TICHENOR, OF LOS ANGELES, CALIFORNIA.

SOUND REPRODUCER.

Application filed July 31, 1922.

Y '0 all whom it may cone-61%:

Be it known that I, Gnonon G. TioHnNon, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Sound Reproducer, of which the following is a specification.

This invention relates to new and useful improvements in sound reproducing devices and is adapted in general to any source of sound production which depends on the vibration or operation of a diaphragm for producing a reproducing sound. The invention is particularly useful in telephone receivers, radio receivers and phonograph reproducers.

An object of this invention is to provide a means for absorbing any excessive vibrations which originate in or are imparted to the sound producing diaphragm, and thereby to emit from the sound producer only a clear resonant tone.

In the common forms of sound reproducers, such as telephone receivers, phonog 'aph reproducers, there is more or less of what I refer to as excessive vibrations. These vibrations are in general due to imperfections in the repeating or reproducing device and generally manifest themselves as rattling, scratching or rasping sounds. These vibrations are caused by a number of different means such as the over-charging of the receiver whereby the receiver cannot readily respond to subsequent vibrations due 'to the resiliency or tendency of the dia-.

phragm to sustain the preceding vibration, or are caused by looseness or other mechanical defect of the receiver, whereby the diaphragm loosely rattles in the device, or are in the case of a phonograph, by the sound producing diaphragm vibrating according to scratches or imperfections in the record.

My invention is adapted to eliminate these excessive vibrations and has a very remarkable and pronounced effect upon the modulation and resonance of the emitted sound. Particularlyin a receiver used in connection with the radio receiving device, there is a large amount of these so-called excessive vibrat-ions.

One of the objects of my invention is to provide a radio loud speaker attachment, such as is used in connecting the conventional radio receiver to the horn of a phonograph which will emit the sound into the horn in an exceptionally resonant tone.

Serial No. 578,599.

Other objects of my invention will be more readily understood from the following drawings which illustrate a number of embodiments of my invention.

Figure 1 is an elevation partially in sec tion of a radio loud speaker attachment embodying the principles of my invention.

Fig. 2 illustrates the embodiment of my invention in a conventional telephone receiver, said telephone receiver being shown partially in section to disclose the diaphragm sound producing mechanism.

Fig. 3 illustrates the embodiment of my invention in a phonograph reproducing device and is shown partially in section.

Referring to Fig. l of the drawings, 1 generally indicates a conventional radio receiver. 2 indicates an attachment case; 3 a clarifying diaphragm. As shown, the case 2 contains a cylindrical opening at adapted to be attached to the horn of a phonograph. The cylindrical opening t is provided with a screw for securing the device to the horn. 6 indicates a clamping plate for holding the radio receiver in the case and 7 indicates screws for maintaining the clamping plate on to the case. The case 2 is properly recessed as indicated at 8 to contain the expanded portion of the radio receiver and further recessed as indicated at 9 for supporting the clarifying diaphragm 3. The diaphragm 3 is held in the case by means of two rubber cushions 10 which consist of small rubber tubing. The radio receiver is clamped against these rubber cushions 10 thereby holding the clarifying diaphragm 3 in place.

The clarifying diaphragm 3 is preferably composed of pure mica, although other materials may be used. It should contain an aperture 11 which aperture is preferably substantially equal and similar to the aperture 12 in the radio receiver. 13 indicates the customary sound producing diaphragm operated as usual by electro-magnetic means 14.

In use the attachment is secured to the horn of a phonograph by means of the screw 5, the cylindrical opening 4; surrounding the contracted end of the phonograph. The electrical current generated or received in the wireless receiving system will cause the diaphragm 13 to vib'ate, emitting sound through the aperture 12, which in turn. causes the clarifying diaphragm to vibrate which diaphragm will be found to absorb by .such .lnembe .5 mu in i stricting member I :ture preter ablyflsubstantially equal to the shown in Fig. ;1.

any excessive yibrations from the producing diaphragm 13 and to emit the sound to the horn in a remarkably clear and resonant tone. 7

In Fig. 2 I have illustrated the e mbodiment of my invention in a telephone'receiver wherein it operates substantially similarto the operation of the radio loud speaker at tachment and absorbs the excessive vibrations and increases ,the .clearness, or resonance of the emitted sound. The receiyerup to and 111clud1uwthe sound )I'OClLlClll fillaphragm 1 3 ,may be I s milar ,to the cgnstruclen in w t t e ers Ehis restrict ng member 15 is shown screwethreaded intothe @a wtthe-t lmhm eire withh ld the p odu ing diaphra m .3 i ela ention is directechtothe tactthatthe,restrictg ne i be 31-;

suiot a diaphragm, i. e. of

the requisite character to respond to fre- .qu'encie civilisationsudta e'ea t in w nd- The member -15 acts to restrict the emission f th ;soundt vibra i ns ram1th P O- ducin fldiaphragm tothe aperture of the restricting member so ,that c all sound passing through the aperture 12 thereof. The clarifying diahragm 3 is ma nta ne .a jeeen h i 15. and contains an aperaperture er the restriqting ,mefrilber 15. The clarifying diaphragm 3 isproyided with two rubber cushions similar to those :The cover plate 16 is slightly la ger than .i ua a emles' h r inememb an is rity e; ld a- Vphragm 8 and maintains these parts ,in ppsition asshownin ;Fig. 2.

{Listening to :Fig. 3 of the drawings, l have shown an embodiment of my inyention in the sound producing equipment of a phonograph. Elie needle nechanismot the producing diaphragm is made of any of the preferred constructions which are well nodulati'on of the tone and struments. .my invention s net which the yibr similar to the others described. Theclarifying diaphragm 3 contains an aperture 11 preferably substantially equal and similar to the aperture 12 in the restricting member 15. It will .be found by this combination that the sound emitted from the phonograph-will be markedly in'iproved in the quality or that a largenu nber ot the rasping or,,rattling sounds will be eliminated.

sh n be seen tromthe foregoing ,descript on, my nvent on consists pr marily n combining with sound producing 'diaphragma second or clarifying diaphragm which clarifying diaphragm is capable of absorbing from the producing diaphragm the atom-mentioned excessive vibrations and of emitting the sound in a clear resonant tone. My inventioiriscapable of beingembodied in a lnnnber ot ditierent ways and applied in a wide number of different in- .It is understood,therefore, that limited to theembodt ments shown but is of the scope set forth in the ,following, claim.

' I claim:

In a sound mounted therein, a stilt sound restricting and having a single central aperture through c H ations of the producing ;d'iaphijagmare em tted, and a clarifying phragm having a single aperture almed with and of equaldia ne'ter to the firstof said apertures, and adapted to absorb vibrations ofthe sound producing diaphragm.

Signed at Los Angeles, California, this th day of July, .1922.

V I G. TICHEN producing device, the combinat on ,of ,a container, a diaphragm rig dly 

